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2 Sheets-Sheet; 1.

J. P. STABLER.

Patented Oct. 9, 1883.

I Inventor @wmo i (No Model.)

MAGNETO GENERATOR 0E ELECTRICITY. No. 286,497.

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2 Sheets-Sheet 2.

(No Model.)

J. P. STABLER.

MAGNET@ GENERATOR 0E ELECTRICITY. No. 286,497. Patented Oct. 9, 1883.

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UNITED STATES PATENT OFFICE.e

JAMES I. STABLER, OF SANDY SPRING, MARYLAND.

MAGNETO-GENERATOR OF ELECTRICITY.

SPECIFICATION forming part of Letters Patent No. 286,497, dated 'October 9, 1883,

Application tiled November 20, 1882. (No model.)

To @ZZ whom, it may concern:

Be it known that I, JAMES I). STABLER, of Sandy Spring, in Montgomery county, in the State of Maryland, have invented new and useful Improvements in liIagneto-Gcnerators of Electricity; and I do hereby declare that the following is a full and accurate description of the same.

The object of my invention is to vary the strength of current at will without changing the speed of the armature, and without the interposition of resistance in the line-circuit for that purpose.

In an individual call apparatus fortelephonie purposes invented by me, and secured by Patents numbered 265,455 and 265,456, I have two magneto generators of diiterent strength, the currents from either being applied to the lineat will, that of the weaker being a to-aud-fro current taken off without a commutator, and that of the stronger being applied by means of make-and-break contacts arranged to take' off a current in one direction only.

My present invention consists of a magnetogcnerator the armature of which is so wound that by means of proper contacts either the intensity or quantity of the current taken from it may be varied at will without changing the speed of its revolution, the intensity of the held-magnets, or thc resistance ofthe external circuit. I am enabled by this means to dispense with one of the generators heretofore used.

It is well understood that the intensity of a magneto-current depends upon the length of the bobbin-wire, and that the quantity of said current depends upon the cross-sectional area of said wire. Thus, by winding the wire of the bobbin er bobbins so that the current may be taken olf at dilferent points as toits length, the intensity may be correspondingly varied, and by winding the bobbin or bobbins with several wires, one or more of which may be connected with the line, the quantity of the current may be varied; therefore it is possible to vary both the intensity and quantity, or to vary the intensity with a given quantity, or to vary the quantity with a given intensity.

I am aware that a magneto-generator has been constructed with a series of separate armatures and bobl'iins arlj'anged around a single axis of revolution, and that separate currents have been taken from such a generator by coupling said armaturc-bobbins in separate series, each series having its own commutator contact or collector. rIhis is in effect a series of separate generators the single members whereof are separately capable of giving off but single currents, and in that it differs from my invention, which causes the single member to give off several currents.

I am also aware that a revolving armature comprising two cylindrical bobbins have been wound with loops taken off at dii'rerent corresponding points on each of said bobbins, and said loops provided with contact, either pair of which might be connected with the line and return circuit for the purpose of varying the intensity of the current; but that differed from my present invention, because, as in all other armatures heretofore wound, so far as I am aware, the helices at the two poles of said armature constituted parts of a single circuit and gave off but a single current, whereas in my invention the helices at the opposite poles of the armature are provided with an intermediate ground or return connection, and there- 'fore constitute parts of separate circuits and ygive oit separate and independent currents.

In the device referred to above, the wire traversed by the induced current is that included between the two loops with which contact'is at the time made, and but a single current is given off. In my invention the length of wire traversed is that between the ground or return connection each way to the loops with which contact is made, and two separat-e and independent currents are given off, and, as the separate helices are provided with separate loop-contacts, the currents given off may be of different intensities, if it should be so desired. However, this is mentioned merely by way of illustrating the essential difference bctween my improvement and that which has been heretofore described.

Vith the said individual-call 7 instrument I employed comparatively weak to-and-fro currents from one armature and a eompartively strong current in one direction, only from another armature, with greater internal resistance and a more intense magnetic iiel d. rlhcrefore the weak current was taken off without a IOO commutator and the strong current was taken off with a make-and-break single-current contact. This involved the necessity of employing two independent generators. I l Y y invention the same result is accomplished with ya single generator by providing the armature ing a typical arrangement of the bobbin-wires nections for variations as to quantity.

for variations as to intensity. Fig. 1 shows the commutator connections thereof. Fig. 2 is a longitudinal section, showing the contact-con- Fig. 3 is a full plan of an armature as I have constructed it, without the wires. Fig. .tis aperspective of my commutator-key. Fig. 5 is aside elevation of the same. Fig. 6 is a plan ofthe same.

A is an ordinary Siemens armature with two coils. The wires of the several coils are approximately of the same length. If it is desired to vary the intensity of the current, loops b of the wire are taken out, and these loops are separately placed in electrical con` nection with contacts e e on the armature-spindle, while the outer terminals are electrically connected with the contacts d d, so that the current may be taken off from either of said contacts d or e at will, and the effective length of wire being thereby varied, the intensity of the current will be correspondingly changed also, It will be understood that the circuit is completed by giving the inner terminals of all the strands or bobbins a common connection, as at a, through the spindle of the armature and its frame, or a suitable contact-spring provided for that purpose. To vary the current quantity, connection is made with one or more of the bobbin-wires by means of suitable contacts, and having a common returnconductor, the quantity of the current is in proportion to the number of said wires so connected. This is a typical description of my armature. For the purpose of my individual call, hereinbefore alluded to, I do not require to employ variations as to intensity, and therefore, for convenience, the following particular description will be confined to the structure of the armature, &c., as I now employ them; but the same structure Aprecisely may be employed to vary the intensity, the electrical connections only being changed accordingly. It will appear evident, also, that to secure variations both of intensity and quantity, at will, will only require the application of additional contacts, and without requiring further invention.

In the following description I will, for-convenience, refer to a generator (shown in Figs. 2 and 3) which I have Yemployed with my individual-call instrument before alluded to, but

without intending to limit myself to the conlD is the armature-spindle.

struction shown therein, because," as every electrician will understand, the number of bobbinsmay be multiplied without changing the naturevof the results described.

B B are the field-magnets. C is thel frame. The spindle D is perforated transversely to receive an insulating-plug, g, and from its extremity it is bored axially to receive another insulating-plug or bushing, h, which projects inwardly beyond the end of the spindle to receive and support the rings e' e, to which are attached the contacts d. The plug h is bored axially, and the cavity extends into the plug g, so that a metallic pin, t', extends through said bushing h into andI past the center of plug g, but not through it. The pin 'i is split lengthwise through its center to a point beneath the ring e, and then the portion i is cut off and separated from the portion i by a strip, m, of someinsulating material.

The connecting-screws K K are inserted endwise into the plug g and their ends severally brought into electrical contact with the separated parts of the pin z'. The outer terminals of the bobbin-wire are then respectively attached by solderor other suitable means to the screws K K. Each of the rings e e is placed upon the bushing h and -secured in position by a screw, n, which passes through the bushing h and makes contact with the pin t' and part i', respectively. Each of said rings is provided with a contact, d, which I find it convenient to make in the form of a lateral extension or finger to engage with the contact, spring F at the proper period of its revolution. The outer terminal of the bobbin-wires being thus separately connected with rings e e, vthe currents may be taken off from one or both and jointly or separately used, as may be desired.

To operate the `motor-magnets of my individual call, I make permanent contact with the end of the pin ,i by means ofthe spring p, and thus obtain a to-andfro current from one of the bobbin-wires. When the motor-magnets have moved the traveling switch to the proper IIO point and it is desired to pass a stronger current to the line to operate the bell or detent, then the to-and-fro current by way of spring p is switched off, and the two currents by way of springs F F are switched onto the line, thus giving twice the quantity of the to-and-fro current. This is conveniently done by means of a key, Q, modiiied in structure from the keys for a similar purpose, heretofore shown in my patents referred to.

The key Q is pivoted to a post, q. I find it convenientto place the key Q and the centraloffice instrument described in my patent before referred to in the ground-circuit of the generator A. At its rear end said key is provided with an elastic or spring extension, r, and a groundpost, S, is provided with a contact for said spring and properly placed, so that said contact willbe made when the front end of the keys is depressed, and broken when said front end is raised. The object of this is to close the break which normally exists in the ground-circuit of the generator by the same movement that connects the outer terminals of the armaturehelices with the line. The key Q bears an insulating-lnitton, fu, near its forward end, and a switch-spring, o, passes under said button, making contact at its free end with the linepost fw when the key Q is free. and breaking said contact when said key and spring are depressed. The post it is in electrical connection with the spring p, and therefore when contact is closed with spring c the to-and-fro currents may pass to the line.

A. second spring, y, is so placed that its free end is beneath the spring c, but not in contact therewith, until contact of said spring o with post w is broken. The spring g/is in electrical connection with one of the comnnitator-springs F. Beneath said spring i/ there is a contactscrew, e, which is in electrical connection with the other commutator-spring F. Vhen the key Q is depressed, contact is broken with post w and afterward made with post s. The fur: ther depression of said key electrically connects the springs 113/ and pin z, and the combined or quantity current of single direction from both bobbin-wires is passed to the line.

Having described my invention,what I claim as new is- 1. An armature for a magnetogenerator having its bobbin wire or wires divided into several sections electrically by means of loops connected with independent commutators, substantially as described, whereby the current may be varied ,either as to intensity or as to quantity, or both, as set i'orth.

2. In a magneto-generator, an armature the opposite poles whereof are provided with separate helices so wound as to give off coincidently currents in the same direction,one terminal of each helix being connected with the ground or return circuit and the other terminal of cach being connected with the linef cominutators.

3. An armature for amagneto-generator the bobbin-wire whereoil is at its middle length connected with the return or ground circuit, and at one or more points of its length, between its terminals and said ground connection, in electrical connection with corresponding independent commutatoi,"contacts,whereby the intensity of the coincident currents may be varied at will.

4L. An armature for a magneto-generator the bobbin-wire whereof is in several strands, one corresponding terminal of each being perma nently connected with the returnconductor, and the other corresponding terminals being severally connected with the pin i and its insnlated portion fi', and the commutator-rings c c, connected therewith, combined with the coinniutator-springs F F and p, substantially as and for the purpose set forth.

5. rllhe combination of a magneto-generator provided with connnutators whereby to-and* i'ro or single-direction currents may be taken off at will, a connnutator-key, Q, in the returncircuit, provided with an elastic extension, r, for making contact with post S, and the switchspring c and contact line-post lw, and the single-direction current-contacts i/ c, adjustedto make Contact with the switch-spring fu when depression of said key Q, has broken its contact with post nu JAMES P. STABLER. lYitnesses:

lil. D. O. SMITH, M. Y. Smrn. 

